I had an infiltrator with about 60 sword, 60 infil skill. He was alone in a region together with a priest. He got caught by "guards" trying to stab the priest. All those invisible, apparition like dudes that suddenly materialised out the ether the moment I tried to do something suspicious.
Edit: so at the moment, no. Unless you have a lot of time and gold, and don't mind losing honour/prestige, getting deported or eventually executed.
Maybe with the new changes, however.
Poll